Silver modified SBA-15 for Iodine entrapment

Micheal P Moloney (1) , Nicolas Massoni (1) , Hans-Conrad Zur Loye (2) , Shani Egodawatte (2, 3) , Agnes Grandjean (1, 3)

1 DPME - Département de recherche sur les Procédés et Matériaux pour les Environnements complexes
2 University of South Carolina [Columbia]
3 Center for Hierarchical Waste Form Materials,

A green solvent-free approach was used to produce grey coloured Ag/AgNO3 functionalised SBA-15. This easy to handle powder was then used to extract molecular Iodine from cyclohexane by simple addition and filtration. The resulting yellow powder was examined by UV-Vis, FT-IR, XRD, TGA and SEM/TEM. It was found that nanosized AgI particles were now present on/in the porous silica support. Despite numerous washing steps with a range of solvents (ranging from cyclohexane to water) no leeching was observed. The sorbent proved highly efficient extracting 0.46 moles of I2 for every mole of silver, almost 1:1 Ag:I. Finally, TGA demonstrated an increased melting point for AgI indicating a degree of protection from the silica support. This is important when considering transformation into the final waste form.

Mots clés: Solvent free; SBA-15; Silver nanoparticles; Iodine Extraction

Domaines: Chimie inorganique; Chimie de coordination; Matériaux

Micheal P Moloney, Nicolas Massoni, Hans-Conrad Zur Loye, Shani Egodawatte, Agnes Grandjean. Silver modified SBA-15 for Iodine entrapment. Journal of Inorganic and Organometallic Polymers and Materials, 2020, 30 (7), pp.2756-2763. ⟨10.1007/s10904-020-01447-3⟩. ⟨cea-03564253⟩